Why dont you attach a melody of "Happy Birthday to You" to a celebrate birthday tweet?
You can easily do it with this app.
1. Select the person you want to send a message from the following list.
2. Tap the Reply button.
3. Type a message.
4. Select a background image from your photo stream.(available in Full version.)
5. Select a melody.("Happy Birthday to You" or "Auld Lang Syne")
6. Tap the Tweet button.
A movie with a melody flowing with your chosen picture as background will be attached to the tweet.